NASA Astronaut and STS-127 Mission Commander Mark Polansky, far left, answers questions at the NASA Tweetup event held at NASA Headquarters, September 24, 2009 in Washington. Nearly 200 of NASA's Twitter followers are in attendance. Photo Credit: (NASA/Carla Cioffi)
Addeddate
2010-01-01 21:14:31
Identifier
200909240015HQ
Pictured
Christopher Cassidy Dave Wolf Doug Hurley Mark Polansky Tom Marshburn
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